County profile · EPA SDWIS + UCMR5
Ottawa County, Ohio
37 SDWIS-listed public water systems serve 42,830 people in Ottawa County. Violation rates use that full inventory; PFAS rates use only the UCMR5-tested subset.
- 37
- SDWIS water systems Larger third of counties
- 2,556
- Total violations Middle third of counties
- 97.3%
- SDWIS systems w/ a violation Middle third of counties
- 33.3%
- UCMR5 PFAS rate (3 tested) Middle third of counties with tests
SDWIS compliance plate
Sheet OH123 · Ottawa County 37 sys · 2,556 viol · #1059/3254
VIOL-SEVERE · HEALTH-MID · RANK-UPPER · PHOTO-FINISH · PFAS-MID · SRC-GW · SYS-SMALL · BOOK-FULL
- VIOL-SEVERE 97.3% flagged
- HEALTH-MID 30.4% health
- RANK-UPPER #1059/3254
- PHOTO-FINISH ±0.6 pp
- PFAS-MID 33.3% detect
- SRC-GW GW lead 76%
- SYS-SMALL 37 systems
- BOOK-FULL 7/7 fields
Nearest flagged-rate peer: Clark County ( -0.6 pp flagged-rate)
According to EPA SDWIS county population served used on /counties, Ottawa County ranks #1,059 of 3,254 counties by people served, and #49 of 88 counties in Ohio. See methodology · corpus placement.
Ottawa County standing, mid-flagged corpus third
Flagged-system rate 97.3% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 30.4% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 33.3% is UCMR5 detect rate in the tested-pool middle third (≤ 33.3%) . Population served ranks #1,059 of 3,254 · #49 of 88 in Ohio.
Flagged-rate neighbourhood around Ottawa County
Lowest/highest poles plus in-state counties nearest Ottawa County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.
Water Systems
Compare beyond Ohio
Mid-flagged peers for Ottawa County
Cross-state counties nearest Ottawa County on flagged-system share (97.3%) and cumulative violation count (2,556). In-state neighbours stay on the compliance plate above.
Similar flagged-system rate
Nearest cross-state counties by % of SDWIS systems with at least one violation on record.
Similar violation load
Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).
Read our methodology · Check your water system - how this data is sourced, computed, and verified.
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.